Randox Grand National favourite Cloth Cap was slashed to 6-1 (from 14s) after comfortably landing the Premier Chase at Kelso on Saturday.
It was the perfect dress rehearsal for Aintree as the nine-year-old made all and jumped fluently under Tom Scudamore, who was recording his 50th success of the season, before beating Aso and Two For Gold.
"He was impressive at Newbury last time and did a nice job there," said trainer Jonjo O'Neill. "He just keeps galloping and he jumps well. Hopefully we can keep him fit and well ahead of Aintree."
Scudamore was equally impressed with the performance and added: "He does all the talking and it's exciting for everyone involved. He's a deserving favourite for the Grand National but who knows, a horse might win the Gold Cup this month and end up a stone well in."
Cloth Cap, who is owned by Trevor Hemmings, faced five rivals at Kelso after Cool Mix was withdrawn at the start on veterinary advice.